Any hunt in this is going to be more based on the rain gear than anything else. Those temps need waterproof top and bottom, and that will cut wind and hold heat in well.
I could easily see a light base, a light mid, and a rain jacket with hood on top. Beanie of some sort or ball cap.
On bottom a base, a pair of waterproof pants and waterproof boots.
This will get you plenty warm until you stop or wet out, or sweat out depending on exertion. The need for moisture wicking and quick drying materials on the base layers is key for this.
However, if you stop for any extended period of time you could cool off fast, so dont stop too long in the rain.
I shed hunted this past weekend in 45 with off and on rain in a tshirt, underarmour dry fit long sleeve and a forloh all-clima jacket on top with ball cap, and outdoor vitals satu pants on the bottom with a pair of waterproof boots and was fine for hours walking through the woods and open pastures. My legs got a little wet, but not bad and i was very comfortable with no load/backpack. Adding weight/weapon/load, and i would have been fine with a light base alone i am sure amd the vents on top and bottom. The rain gear keeps the heat in as good as it keeps the wet out.
